Leaderboard Cloud Gem
Resources

The following table lists the resources used by the Leaderboard Cloud Gem.

Resource

Description

BannedPlayerTable

A list of players that are no longer allowed to submit scores.

LeaderboardInfo

Information for each statistic about the state of the leaderboard,
including population and maximum sample size.

LeaderboardTable

A table that contains a set of scores for each statistic. The set is a
sample gathered using a reservoir
sampling method. The sets are used to estimate where an
arbitrary player's score sits within the entire population. This allows the
cloud gem to estimate global rankings.

MainTable

The main database for scores. Entries are keyed on userID
with a score attribute for each metric. This table allows you to gather the
most up-to-date information on a specified set of players.

RecordsBucket

An Amazon S3 bucket that holds all the records written by
ScoreStreamReader.

RecordSetProcessor

A Lambda function that reads through all pending records and decides
whether the samples on LeaderboardTable need to be updated.
This Lambda function is triggered by the timer
RecordSetProcessorSchedulerRule that has a default of 10
minutes.

RecordSetStatus

A table that keeps track of the status of all record sets. Sets can be
OPEN (accepting new records), PENDING (not
accepting records, to be processed soon), or CLOSED (processed,
waiting for cleanup). The information in RecordSetStatus
determines which record set RecordSetProcessor processes and
where ScoreStreamReader puts its next record.

ScoreStreamReader

A Lambda function triggered by DynamoDB updates to MainTable.
Writes records to the Amazon S3 RecordsBucket for later
processing.

StatsSettings

A table that specifies how to process specific statistics from
submissions. Holds minimum and maximum values for each statistic and
specifies whether it is to be overwritten or incremented on
submission.

UserIdentityMap

Maps user IDs to Amazon Cognito IDs to ensure that scores can't be submitted on
another player's behalf. After an ID is used for the first time, it is
maintained by the Amazon Cognito ID.

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